I noticed when I took the car for a test drive after installing the Hedman Longtube headers that when I was just cruising and getting ready to punch it for a WOT throttle, the shifter was loose when I was in any gear. There was alot of play. Can anybody tell me whats wrong and how it can be fixed?

get under the car and check the linkage bolted to the trans pan.

how should it fit? What exactly am I looking for?

see if its come unbolted, its seems to be a common issue. It bolts to the pan, make sure that bracket is tight, and make sure that the bolt in the linkage it there/tight as well.

Alright, I hope this is it. This would save me money instead of getting an aftermarket shifter.